Sheet depositing device



April 19, 1932.

R. WICHMANN SHEET DEPOSITING DEVICE Filed NOV. 10, 1950 /n venfor': W

Patented Apr. 19, 1932 PATENT OFFICE REGINALD WIGHMANN, OF-CHISLEHURST,ENGLAND SHEET DEPOSITING DEVICE Application filed November 10, 1930,Serial No. 494.67? and in Germany November 12, 1929.

Sheet depositing devices with chain grippers are already known, in whichthe sheets are gripped at the rear end of the chain gripper path byrocking lever grippers, by

L} which they are deposited on the pile at a reduced speed. It is alsoknown, that the chain grippers, which take over the sheet and slowlydeposit same, are oscillatably mounted in the rocking levers and carryout a positive downward movement besides the oscillating movement. Theseknown devices are actuated by cams and possess the inconvenience,

that the sheet can only be deposited with a certain retardation as faras a cam will allow. A further objection is, that in the known devicesthe gripper system was not moved over the sheet last deposited with theresult, that very often in the case of thin paper the upper sheet isagain pulled back.

The novelty consists in that, instead of a stationary curved guide forcontrolling the rocking grippers, a groove guide controlled by a cam isprovided. The result of th 1s a'rrangement is, that the downwardguiding, as also the conducting of the rocking gripper over the sheetlast deposited can be adapted or adjusted to the thickness of the paperto be printed. I

In order to obtain the greatest retardatlon of the sheet, the rockinglever is driven by a crank gearing. By this improvement it is possible,in utilizing the retardation occurring near the dead centre for the laststroke of the sheet depositor, to feed the sheet, in conjunction withthe improvement described in the previous paragraph, quietly and reliably to the pile of paper, even at a high speed.

An embodiment of the invention is illustrated diagrammatically by way ofexample in the accompanying drawings in which:

Fig. 1 shows the parts in the sheet delivering position.

Fig. 2 shows the parts in the sheet depositing position.

Fig. 3 is a top plan view of the rocking lever with the gripper system.

Fig. 4 is a side elevation of Fig. 3.

Fig. 5 shows the position of the parts during the return movement of thegripper system after depositing a sheet.

' 1 designates the known depositing chain Withthe gripper system 2 whichbrings the sheet 3 from the machine. The sheet has to be slowed down onthe sheet stop 4; of the deposit pile 5, and deposited at right anglesto the edge 4. 6 represents the known rocking lever. The gripper system7 taking over thesheet ismounted on a two armed lever 8, which isoscillatably mounted in the levers 6. The gripper system 7 performsbesides the oscillating movement (arrow a) a downward movement 7),before the sheet'arrivesin the horizontal plane relative to the sheetstop 4 Thus the sheetS in Fig. 1 is conducted along the path 0, whichrepresentsthe resultant of the movements a and b, downwardly at anincline and passes horizontally through the last portion (lot thetravelup tothe'sheet To stop 4. A continuous retardation of the sheetoccurs duringthe said travels 0 and d.

A pin 10 is ec'centrically mounted on a spur wheel 9 driven in knownmanner. A rod 11 is'mounted loosely oscillatabl'e on the pin 10- and hason its other'end' a pin 12', on which an elbow lever with the arms 13and 6 is arranged. This elbow'lever is pivotally mounted onthe pin 14.-The lower end of the lever arm 6" is fixed on a pin-15. The tWo-armedlever 8 is V loosely pivotably mounted on the pin 15, the gripper system7 being fixed to one arm of this lever, whereas a 1301191116lSmOUHtBCl'OII the other arni of the lever 8. 'This-r'oller I6 is guidedby a groove 17 in guide bar 18 which ispivotally mounted on a pin 19. Onthe upper side of the guide bar 18 a rigid pin 20 is fixed, onwhich arod 21 is arranged. The rod 21 has at its other end a pin 22, on whichthe arm 23 05 a two armed lever 23,525 is hinged, said lever being pivotally mounted on a pivot pin 24. The free end of the lever arm 25 carriesa roller 26 bearing against a cam disc 27 This cam disc is keyed on thedriving shaft 28, on which the spur Wheel 9 is keyed.

The operation is as follows:

If the shaft 28 revolves, the elements move from the position showndiagrammatically in Fig. 1 into the position shown in Fig. 2 m

during one half revolution of the shaft 28. The selection of a crankdrive 10, l1, 13 for the rocking lever 6 presents the advantage, thatnear the lower dead centre 30 a great retardation of the movement of thegripper system 7 occurs during its travel along the portion (Z of thepath of the sheet depositing. The rocking lever 6 merely performs amovement along the are 31. In order to 10 obtain the travel 0 and d ofthe gripper system 7, the lever 8 hingedly connected to the rockinglever 6 is controlled by the cam disc 27 and the elements coupled to thebolt thereby. Owing to the cooperation of the crank gearing with theadjustable control of the groove guide, the gripper system performs amovement, which can be adapted to the trajectory of the sheet for thedifferent kinds of paper. The cam e on the cam disc 27 lifts the grooveguide 17 by means of the connecting elements 20 to 26 at the instant, iwhen the sheet reaches the stop 4:. By this i lifting of the grooveguide 17, the grippers 7 are also raised and freely moved back over thesheet last deposited (Fig. 5) so that, when the machine is running athigh speed, a beating back of the last deposited sheet by the returninggripper 7 cannot occur.

I claim 1. A sheet depositing device comprising in combination a sheetstop, a rocking lever adapted to first move the sheet downwards to theupper surface of the pile and then horizontally up to said sheet stop, acrank gearing, an elbow lever adapted to drive together with said crankgearing said rocking lever utilizing the retardation occurring near thedead centres for the last portion of the sheet depositing travel, agripper system, a lever to. which said gripper system is attachedoscillatably mounted on the end of said rocking lever, a roller on theend of said lever, a groove guide adapted to guide said roller, a camdisc adapted to regulate the vertical position of said groove guide, andtransmission elements adapted to transmit the novement of said cam discto said groove 2. A sheet depositing device as specified in claim 1, inwhich the cam disc has a cam adapted through the intermediary of thetransmission elements to guide the gripper system back into its initialposition in raised position above the pile after a sheet has been deosited.

J n testimony whereof I'afiix my signature.

REGINALD WICHMANN.

